US4552786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for densification of ceramic materials
Assignee: McDermott Technology Inc
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Filing: 1984-10-09
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Granted: 1985-11-12
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Expires: 2004-10-09
Abstract
Abstract Supercritical fluids may be used to carry ceramic precursor materials into the pores of a ceramic host. Reducing the solubility of the ceramic precursor in the supercritical fluid will cause deposition of the ceramic precursor in the pores or void spaces of the ceramic host and accomplish densification of the ceramic host material.
Inventors
- 👤 Philip L. Berneburg
- 👤 Val J. Krukonis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:37
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C04B35/58; C04B35/584; C04B35/589; C04B35/71; C04B35/78; C04B35/80; C04B41/45; C04B41/50; C04B41/5025; C04B41/5053; C04B41/80; C04B41/81; C04B41/85; C04B41/87
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
55 words
A process for increasing the density of a ceramic material which comprises: a. dissolving a ceramic precursor in a supercritical fluid; b. infiltrating the ceramic material with the ceramic precursor-laden fluid; and c. reducing the solubility of the ceramic precursor in the fluid to deposit the ceramic precursor in void spaces of the ceramic material.
Claim 2
Dependent Claim
55 words
A process for increasing the density of a ceramic material which comprises: a. dissolving a ceramic precursor in a supercritical fluid; b. infiltrating the ceramic material with the ceramic precursor-laden fluid; and c. reducing the solubility of the ceramic precursor in the fluid to deposit the ceramic precursor in void spaces of the ceramic material.
Claim 3
Dependent Claim
33 words
A process according to claim 1 wherein the supercritical fluid is one selected from the group consisting of methane, ethylene, carbon dioxide, ethane, nitrous oxide, propane, butane, and chloro-, fluoro-, and chloro fluoro-hydrocarbons.
Claim 4
Dependent Claim
58 words
A process for increasing the density of a silicon nitride material which comprises: a. dissolving a ceramic precursor in a supercritical fluid; b. infiltrating the silicon nitride material with the ceramic precursor-laden fluid; and c. reducing the solubility of the ceramic precursor in the fluid to deposit the ceramic precursor in void spaces of the silicon nitride material.
Claim 5
Dependent Claim
58 words
A process for increasing the density of a silicon nitride material which comprises: a. dissolving a ceramic precursor in a supercritical fluid; b. infiltrating the silicon nitride material with the ceramic precursor-laden fluid; and c. reducing the solubility of the ceramic precursor in the fluid to deposit the ceramic precursor in void spaces of the silicon nitride material.
Claim 6
Dependent Claim
17 words
A process according to claim 3 wherein the silicon nitride is a porous reaction sintered silicon nitride.
Claim 7
Dependent Claim
22 words
A process according to claim 3 wherein the ceramic precursor is a silicon-containing polymeric material which acts as a silicon nitride precursor.
Claim 8
Dependent Claim
59 words
A process for increasing the density of a silicon carbide material which comprises: a. dissolving a ceramic precursor in a supercritical fluid; b. infiltrating the silicon carbide material with the ceramic precursor-laden fluid; and c. reducing the solubility of the ceramic precursor in the supercritical fluid to deposit the ceramic precursor in void spaces of the silicon carbide material.
Claim 9
Dependent Claim
59 words
A process for increasing the density of a silicon carbide material which comprises: a. dissolving a ceramic precursor in a supercritical fluid; b. infiltrating the silicon carbide material with the ceramic precursor-laden fluid; and c. reducing the solubility of the ceramic precursor in the supercritical fluid to deposit the ceramic precursor in void spaces of the silicon carbide material.
Claim 10
Dependent Claim
22 words
A process according to claim 6 wherein the ceramic precursor is a silicon-containing polymeric material which acts as a silicon carbide precursor.
Claim 11
Dependent Claim
20 words
A process according to claim 6 wherein the silicon-containing polymeric material which acts as a silicon carbide precursor is polysilane.
Claim 12
Dependent Claim
59 words
A process for increasing the density of an aluminum borosilicate material which comprises: a. dissolving a ceramic precursor in a supercritical fluid; b. infiltrating the aluminum borosilicate material with the ceramic precursor-laden fluid; and c. reducing the solubility of the ceramic precursor in the supercritical fluid to deposit the ceramic precursor in void spaces of the aluminum borosilicate material.
Claim 13
Dependent Claim
59 words
A process for increasing the density of an aluminum borosilicate material which comprises: a. dissolving a ceramic precursor in a supercritical fluid; b. infiltrating the aluminum borosilicate material with the ceramic precursor-laden fluid; and c. reducing the solubility of the ceramic precursor in the supercritical fluid to deposit the ceramic precursor in void spaces of the aluminum borosilicate material.
Claim 14
Dependent Claim
13 words
A process according to claim 7 wherein the ceramic precursor is aluminum isopropoxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |